EP0371494A2 - Coupleur de modes pour applications monopulsées - Google Patents

Coupleur de modes pour applications monopulsées Download PDF

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Publication number
EP0371494A2
EP0371494A2 EP89122043A EP89122043A EP0371494A2 EP 0371494 A2 EP0371494 A2 EP 0371494A2 EP 89122043 A EP89122043 A EP 89122043A EP 89122043 A EP89122043 A EP 89122043A EP 0371494 A2 EP0371494 A2 EP 0371494A2
Authority
EP
European Patent Office
Prior art keywords
mode
waveguide
coupling
mode coupler
coupler according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89122043A
Other languages
German (de)
English (en)
Other versions
EP0371494A3 (fr
Inventor
Bernhard Dr. Ing. Huder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Original Assignee
Deutsche Aerospace AG
Telefunken Systemtechnik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Aerospace AG, Telefunken Systemtechnik AG filed Critical Deutsche Aerospace AG
Publication of EP0371494A2 publication Critical patent/EP0371494A2/fr
Publication of EP0371494A3 publication Critical patent/EP0371494A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/04—Multimode antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion

Definitions

  • the invention relates to a mode coupler for monopulse applications according to the preamble of claim 1 as e.g. is known from DE-36 04 432 A1. A similar arrangement is described in DE-36 04 431 A1.
  • the mode coupler known from DE-36 04 432 A1 consists of a main waveguide: in which several modes can be propagated and are attached to the mode-selective coupling / decoupling gates.
  • the coupling / decoupling gates are all simple standard waveguides attached to the main waveguide, in which only the H10 basic wave type is capable of spreading.
  • the dimensions of the main waveguide are chosen so large in the known mode coupler that all relevant waveguide modes are capable of propagation. However, the dimensions are not so large that undesirable waveguide modes spread, which can lead to faulty received signals.
  • a mode-sensitive coupling of the H10 and H20 waves gives a sum and a difference diagram (arrow diagram) in the elevation.
  • the H10 mode is coupled out at the end of the waveguide train in a straight line after the main waveguide has been gradually reduced to the standard waveguide format.
  • the H20 mode is decoupled by a side-mounted waveguide.
  • the (H11 + E11) wave which provides the difference diagram in azimuth, is transferred in the known mode coupler in the main waveguide with a separating plate in two antiphase waveguide shafts, as known in principle from EP-PS 0061 576. Your energy is then selectively coupled into the side-mounted waveguide using a coupling bracket.
  • the similarly constructed mode coupler for monopulse applications in an antenna feed system from DE-36 04 431 A1 also serves to obtain angular deposits in azimuth and elevation and consists of a main waveguide in which several modes can be propagated and are attached to the mode-selective coupling / decoupling gates.
  • Another coupling / decoupling gate for coupling / decoupling a mode orthogonal to the sum mode is implemented as a simple waveguide attached to the main waveguide, in which only the H 1 -wave wave type is made is spreadable.
  • a metallic reflector is inserted in the main waveguide, which reflects the orthogonal mode in the attached waveguide.
  • the object of the invention is to provide a mode coupler of the type mentioned at the outset, which allows further modes to be decoupled.
  • the invention is characterized in claim 1.
  • the further claims contain advantageous developments and exemplary embodiments of the invention.
  • the structure of the mode coupler (FIG. 1) is identical in its basic structure to the known arrangement cited at the beginning.
  • the dimensions of a main waveguide HH are to be chosen so large that all relevant waveguide modes are capable of spreading. However, the dimensions must not be so large that undesirable waveguide modes spread, which can lead to faulty received signals.
  • By mode-sensitive coupling of the H10 and H20 wave the field images of FIG. 2a, a sum and a difference diagram (arrow diagram) are obtained in the elevation (FIG. 2b).
  • This part of the arrangement is identical to the arrangement described in Skolnik's textbook.
  • the H10 mode is coupled out at the end of the waveguide train in a straight line after the main waveguide HH has been gradually reduced to the standard waveguide format, H4.
  • the H20 mode is coupled out through a laterally attached waveguide H3.
  • the (H11 + E11) wave which provides the difference diagram in azimuth, is transferred in the mode coupler according to the invention in the main waveguide HH with a separating plate B into two antiphase waveguide shafts, as is known in principle from EP-PS 0061 570. Your energy is then selectively coupled with a coupling bracket K in the side-mounted waveguide H2.
  • Figures 2c and 2d show the field image and the radiation lobe of the (H11 + E11) wave.
  • the mode coupler according to the invention contains coupling openings for decoupling one of the H1on mode orthogonal mode, which is referred to as H01 mode. Its field image and the radiation lobes can be seen in FIGS. 2c and 2d.
  • H01 mode is reflected and coupled out into the symmetrical to the main waveguide HH outgoing waveguide H11 and H10 through slots.
  • These two waveguides are brought together via an H-level junction HV, so that the performance of the H01 mode can be dissipated in the waveguide H1.
  • the waveguide waves of the H10 mode and the H20 mode are not disturbed by the divider B.
  • the H10 basic wave type is capable of spreading. They are preferably designed as standard waveguides.
  • a metallized dielectric can also be used, on which the coupling structures are produced by etching.
  • the simple construction of the mode coupler according to the invention allows production using the electroforming process. This type of production is particularly advantageous for applications at mm wavelengths.
  • a pyramid horn or a grooved horn can be easily integrated at the antenna output of the mode coupler, so that the shape and width of the radiation lobes of the antenna feed system can be influenced.
  • the version with a grooved horn in particular provides the advantage of identical radiation lobes for the two orthogonal sum modes.
  • FIG. 3 shows the possible operating modes of the antenna feed system when using a reflector antenna (main reflector HR, subreflector SR). If the transmit signal S is switched to the H10 gate with the aid of a PIN diode switch PS (the circulators Z serve to decouple the transmit and receive branch), the following signals reflected by the target can be received with the mode coupler MK according to the invention (FIG.
  • H10 gate sum signal, portion not rotated in the direction of polarization ( ⁇ ⁇ ) H20 gate, (H11 + E11) gate: difference signals , portions not rotated in the direction of polarization ( ⁇ e ⁇ , ⁇ a ⁇ ) H01 gate: sum signal, portion rotated in the polarization direction by 90 ° ( ⁇ ).
  • H10 gate sum signal, portion rotated by 90 ° in the direction of polarization ( ⁇ ).
  • H01 gate sum signal, portion not rotated in the polarization direction ( ⁇ ⁇ ).
  • both non-polarization-rotating and polarization-rotating targets can be detected and targeted with maximum sensitivity, or conclude from the ratio of the powers in both polarizations to the properties of the target.
  • the reflections of undesired targets can be partially suppressed in this way.
  • a polarization converter can be provided at the antenna output A of the mode coupler for transmitting and receiving circular polarization.
  • This polarization converter must act on all wave types involved and must therefore be arranged as a flat arrangement in front of the mode coupler (e.g. disk made of birefringent material). The advantages of the arrangement described above are retained because, depending on the direction of rotation of the reflected, i.A. elliptically polarized signal can still be distinguished between targets that maintain the direction of rotation of the wave when reflected and those that reverse the direction of rotation.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP19890122043 1988-12-01 1989-11-29 Coupleur de modes pour applications monopulsées Withdrawn EP0371494A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3840450A DE3840450A1 (de) 1988-12-01 1988-12-01 Modenkoppler fuer monopulsanwendungen
DE3840450 1988-12-01

Publications (2)

Publication Number Publication Date
EP0371494A2 true EP0371494A2 (fr) 1990-06-06
EP0371494A3 EP0371494A3 (fr) 1991-06-12

Family

ID=6368208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890122043 Withdrawn EP0371494A3 (fr) 1988-12-01 1989-11-29 Coupleur de modes pour applications monopulsées

Country Status (3)

Country Link
US (1) US5066959A (fr)
EP (1) EP0371494A3 (fr)
DE (1) DE3840450A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999066596A1 (fr) * 1998-06-19 1999-12-23 Raytheon Company Circuit de reception de radiofrequence
US6498582B1 (en) 1998-06-19 2002-12-24 Raytheon Company Radio frequency receiving circuit having a passive monopulse comparator

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5420597A (en) * 1991-09-12 1995-05-30 Trw Inc. Farfield simulator for testing autotrack antennas
US5216433A (en) * 1991-11-15 1993-06-01 Hughes Aircraft Company Polarimetric antenna
DE19810601A1 (de) * 1998-03-12 1999-09-16 Daimler Benz Aerospace Ag Anordnung zur Füllstandsmessung
US6094175A (en) * 1998-11-17 2000-07-25 Hughes Electronics Corporation Omni directional antenna
GB9900411D0 (en) * 1999-01-08 1999-02-24 Cambridge Ind Ltd Multi-frequency antenna feed
FR2808126B1 (fr) * 2000-04-20 2003-10-03 Cit Alcatel Element rayonnant hyperfrequence bi-bande
US6496084B1 (en) 2001-08-09 2002-12-17 Andrew Corporation Split ortho-mode transducer with high isolation between ports
JP5580648B2 (ja) * 2010-04-09 2014-08-27 古野電気株式会社 導波管変換器及びレーダ装置
DE102010063800A1 (de) * 2010-12-21 2012-06-21 Endress + Hauser Gmbh + Co. Kg Diplexer für homodynes FMCW-Radargerät
CN106935942B (zh) * 2015-12-30 2022-03-18 核工业西南物理研究院 一种大功率电子回旋共振加热系统快速可控极化器
EP3935690B1 (fr) 2019-03-04 2023-11-15 Saab Ab Alimentation d'antenne multimodale bibande

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730677A (en) * 1952-08-26 1956-01-10 Csf Ultra-high frequency wave-mode transformers
US2820965A (en) * 1956-02-16 1958-01-21 Itt Dual polarization antenna
DE1930620A1 (de) * 1968-07-04 1970-01-08 Siemens Ag Wellentypwandler fuer sehr kurze elektromagnetische Wellen
DE2517383C3 (de) * 1975-04-19 1979-03-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Systemweiche für Frequenzdoppelausnutzung
DE2626925C3 (de) * 1976-06-16 1981-01-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zum Ausgleich von Ausbreitungsschwankungen bei Nachrichtenübertragungssystemen
DE3020514A1 (de) * 1980-05-30 1981-12-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Antennenspeisesystem fuer eine nachfuehrbare antenne
US4420756A (en) * 1981-01-19 1983-12-13 Trw Inc. Multi-mode tracking antenna feed system
DE3111731A1 (de) * 1981-03-25 1982-10-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Mikrowellenuebertragungseinrichtung mit mehrmodendiversity-kombinationsempfang
US4511438A (en) * 1983-04-05 1985-04-16 Harris Corporation Bi-metallic electroforming technique
DE3406641A1 (de) * 1984-02-24 1985-08-29 ANT Nachrichtentechnik GmbH, 7150 Backnang Zweiband-polarisationsweiche
GB8501440D0 (en) * 1985-01-21 1985-02-20 Era Patents Ltd Circularly polorizing antenna feed
DE3604432C2 (de) * 1986-02-13 1995-02-16 Deutsche Aerospace Modenkoppler für Monopulsanwendungen
DE3604431A1 (de) * 1986-02-13 1987-08-20 Licentia Gmbh Modenkoppler fuer monopulsanwendungen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999066596A1 (fr) * 1998-06-19 1999-12-23 Raytheon Company Circuit de reception de radiofrequence
US6100841A (en) * 1998-06-19 2000-08-08 Raytheon Company Radio frequency receiving circuit
US6498582B1 (en) 1998-06-19 2002-12-24 Raytheon Company Radio frequency receiving circuit having a passive monopulse comparator

Also Published As

Publication number Publication date
DE3840450A1 (de) 1990-06-07
US5066959A (en) 1991-11-19
EP0371494A3 (fr) 1991-06-12

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